Title: [Plugin: W3 Total Cache] Opcode cache: Not installed Memcache extension Not installed
Last modified: August 19, 2016

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# [Plugin: W3 Total Cache] Opcode cache: Not installed Memcache extension Not installed

 *  Resolved [tollieschmidt](https://wordpress.org/support/users/tollieschmidt/)
 * (@tollieschmidt)
 * [15 years, 11 months ago](https://wordpress.org/support/topic/plugin-w3-total-cache-opcode-cache-not-installed-memcache-extension-not-installed/)
 * First off please excuse my pure ignorance on all of this. I activated the plugin
   got the CDN setup and everything but I’m still getting 3 Items saying “Not Installed”
   and honestly, have no idea what they are, and even after Google them still lost
   on how I install.
 * Also, at the bottom of the check is a few “Orange Highlighted Not Detected” This
   is a copy from the compatibility check.
 * Any help I’d truly appreciate it. The site I installed the plugin on is [http://TollieSchmidt.com](http://tollieschmidt.com)
 * PHP Version: 5.2.8
    PHP Timezone: OK Web Server: Apache FTP functions: OK (required
   for Self-hosted (FTP) CDN support) Multibyte String support: OK (required for
   Rackspace Cloud Files support) cURL extension: OK (required for Amazon S3 support)
   zlib extension: OK (required for compression support) Opcode cache: Not installed
   Memcache extension: Not installed Mime type detection: Not installed Hash function:
   hash (required for NetDNA purge support) Safe mode: Off Open basedir: Off zlib
   output compression: Off mod_mime: Not detected mod_expires: Not detected mod_deflate/
   mod_gzip: Not detected mod_headers: Not detected mod_env: Not detected mod_setenvif:
   Not detected mod_rewrite: Not detected WordPress Resources /home/content/90/4551690/
   html/wp-content: Write-able /home/content/90/4551690/html/.htaccess Write-able
 * Uploads directory: Write-able
    WP_CACHE define: OK Fancy permalinks: OK Network
   mode: Off
 * [http://wordpress.org/extend/plugins/w3-total-cache/](http://wordpress.org/extend/plugins/w3-total-cache/)

Viewing 5 replies - 1 through 5 (of 5 total)

 *  [John Robertson](https://wordpress.org/support/users/braddor/)
 * (@braddor)
 * [15 years, 11 months ago](https://wordpress.org/support/topic/plugin-w3-total-cache-opcode-cache-not-installed-memcache-extension-not-installed/#post-1603191)
 * Those items are not necessarily needed for it to work properly. memcached, apc
   and so on are optional methods of caching, each for their own use depending on
   the server configuration and traffic you get. I have APC (alternative php caching)
   installed so Opcode cache will say Opcode cache: APC but the Memcache extension
   and Mime type detection are also not installed for me.
 *  Plugin Contributor [Frederick Townes](https://wordpress.org/support/users/fredericktownes/)
 * (@fredericktownes)
 * [15 years, 10 months ago](https://wordpress.org/support/topic/plugin-w3-total-cache-opcode-cache-not-installed-memcache-extension-not-installed/#post-1603351)
 * [@braddor](https://wordpress.org/support/users/braddor/) is correct. The compatibility
   tool is to help with troubleshooting, it’s unlikely that most sites need to satisfy
   every item in the list. It’s also unlikely that everything can be detected on
   every server.
 *  [Josh68](https://wordpress.org/support/users/josh68/)
 * (@josh68)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-w3-total-cache-opcode-cache-not-installed-memcache-extension-not-installed/#post-1603423)
 * Be nice if the developers of the plugin changed the meaning of the color red (
   =”bad”) or added another color, like purple (=”probably not a problem”) to their
   compatibility check key. Thanks for the info.
 *  [meshmarketer](https://wordpress.org/support/users/meshmarketer/)
 * (@meshmarketer)
 * [15 years ago](https://wordpress.org/support/topic/plugin-w3-total-cache-opcode-cache-not-installed-memcache-extension-not-installed/#post-1603436)
 * Frederick, it’d really help then if we could sort out what is needed from what
   is informational. It would make this plugin much more user-friendly and dumbed-
   down (which is what I want after a hard day at the office).
 *  Plugin Contributor [Frederick Townes](https://wordpress.org/support/users/fredericktownes/)
 * (@fredericktownes)
 * [14 years, 11 months ago](https://wordpress.org/support/topic/plugin-w3-total-cache-opcode-cache-not-installed-memcache-extension-not-installed/#post-1603445)
 * The intent is not to make things difficult, it’s to make thing work. Once all
   of the feature work, the final release will have simple UIs for addressing problems.
   The plugin simply isn’t finished yet.

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘[Plugin: W3 Total Cache] Opcode cache: Not installed Memcache extension
Not installed’ is closed to new replies.

 * ![](https://ps.w.org/w3-total-cache/assets/icon-256x256.png?rev=1041806)
 * [W3 Total Cache](https://wordpress.org/plugins/w3-total-cache/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/w3-total-cache/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/w3-total-cache/)
 * [Active Topics](https://wordpress.org/support/plugin/w3-total-cache/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/w3-total-cache/unresolved/)
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## Tags

 * [Opcode cache](https://wordpress.org/support/topic-tag/opcode-cache/)

 * 5 replies
 * 5 participants
 * Last reply from: [Frederick Townes](https://wordpress.org/support/users/fredericktownes/)
 * Last activity: [14 years, 11 months ago](https://wordpress.org/support/topic/plugin-w3-total-cache-opcode-cache-not-installed-memcache-extension-not-installed/#post-1603445)
 * Status: resolved